With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swMSTPInstRegionalRootBridge
Switch MSTP Inst Regional Root Bridge
1.3.6.1.4.1.171.12.15.2.3.1.15
For CIST, Regional Root Identifier is the Bridge Identifier of the single bridge in a Region whose CIST Root Port is a Boundary Port, or the Bridge Identifier of the CIST Root if that is within the Region; For MSTI,MSTI Regional Root Identifier is the Bridge Identifier of the MSTI Regional Root for this particular MSTI in this MST Region; The Regional Root Bridge of this instance.
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IPHost Network monitor allows you to monitor swMSTPInstRegionalRootBridge on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link VPN routers right now.